This dictionary contains more than 1,250 entries, illustrated by some 10,000 examples, all defined and explained.

It is based on Michael Quinion’s book Ologies and Isms: Word Beginnings and Endings, published by Oxford University Press in 2002. This work is now out of print and has been edited and presented here as a free service. The plan is to add more entries and examples as time permits as well as improving the thematic index.

These pages contain examples of all four of the types of affixes that appear in English: prefixes, suffixes, combining forms and infixes. For more, see the page about Types of affix.